First, the body mass index formula:
The concept of height and body mass index was first put forward by Belgian generalist kettler in the middle of19th century. It is defined as follows:
Body mass index (BMI) = weight (kg) ÷ height 2 (m)
For example: 70kg (1.75x1.75) = 22.86.
For example:
For example, a person's height is 1.75m and his weight is 68kg, and his body mass index = 68/( 1.75 2) = 22.2 (kg/m 2). When the body mass index is 18.5 ~ 23.9, it is normal.
Body mass index (BMI) is an index closely related to body fat, which takes into account two factors: weight and height. Body mass index is simple and practical, which can reflect the overweight and obesity of the whole body. It is more accurate to measure the risk of heart disease, hypertension and other diseases due to overweight than to identify them simply by weight.
Second, the adult body mass index value:
Too light: less than 18.5
Normal: 18.5-24.99
Overweight: 25-28 years old
Obesity: 28-32 years old
Very obese, over 32 years old.
Because of the error, the body mass index can only be used as one of many standards to evaluate the individual's weight and health status. The National Institutes of Health (NIH) advises doctors to refer to the following three factors to assess whether a patient is overweight.
Body mass index waist circumference-measures the risk factors of abdominal fat and obesity-related diseases, such as hypertension, high LDL ("malignant") cholesterol, low HDL ("benign") cholesterol, hyperglycemia and smoking.
Because the body mass index does not take into account a person's fat ratio, a person with an overweight body mass index may not actually be obese. For example, a person who practices fitness will have a body mass index of more than 30 because of his heavy muscle weight. If their body fat rate is low, they don't need to lose weight.
Third, the body mass index index obesity standard judgment:
Although the World Health Organization has stipulated the obesity standard, it is based on the research data of westerners and is not suitable for Asians. Professor Zhou Beifan from the Epidemiology Research Office of Fuwai Cardiovascular Hospital of China Academy of Medical Sciences wrote in the A7 issue of Popular Medicine that the China Obesity Working Group made a summary analysis report based on the population data of China in the 1990s.
For the first time, the obesity standard suitable for adults in China is put forward: BMI greater than or equal to 24 is overweight, and BMI greater than or equal to 28 is obese; Male waist circumference is greater than or equal to 85 cm, and female waist circumference is greater than or equal to 80 cm.
Body mass index (BMI) is widely used to measure the degree of obesity in the world. Body mass index is equal to weight (kg) divided by the square of height (m). Waist circumference is an important index to measure abdominal obesity, which reflects the degree of abdominal fat accumulation and is related to a series of metabolic abnormalities.
The summary analysis report of China Obesity Working Group shows that the increase of body mass index will also increase the incidence of coronary heart disease and stroke, and overweight and obesity are independent risk factors for coronary heart disease and stroke. The relative risk of coronary heart disease, stroke and ischemic stroke increased by 65,438 05.4%, 6,654.38 0% and 65,438 08.8% respectively with the increase of BMI by 2. Once the body mass index reaches or exceeds 24, the probability of suffering from serious health-threatening diseases such as hypertension, diabetes, coronary heart disease and dyslipidemia will increase significantly.
For different races, the same body mass index may represent different degrees of obesity. The level of body mass index in Asia (including China) is lower than that in European countries as a whole, but according to many studies, Asians are already at high risk of cardiovascular diseases at a low level of body mass index. In other words, when the Chinese body mass index is lower than 25, the risk of hypertension begins to increase.
Fourth, uncomfortable people:
Not everyone applies the body mass index, such as:
1,1under 8 years old;
2. As an athlete;
3. I am doing weight training;
4. Pregnancy or breastfeeding;
5. frail or sedentary elderly people.
If you think that the calculated results of body mass index can't correctly reflect the weight problem, please discuss with your doctor with the results and ask for a body fat test.